# All files / components/Callout Callout.js

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     import React from 'react';
    import PropTypes from 'prop-types';
    import { Manager, Reference, Popper } from 'react-popper';
    import Container from './styles/CalloutContainer';

    class Callout extends React.Component {
      static propTypes = {
        /**
         * Miliseconds to wait before showing the callout.
         */
        delay: PropTypes.number,
        /**
         * Elements to render which will activate the callout on hover.
         */
        children: PropTypes.node.isRequired,
        /**
         * Content to render inside the callout itself.
         */
        content: PropTypes.node.isRequired,
        /**
         * Where to place the element. Use a value from react-popper
         */
        placement: PropTypes.oneOf([
          'auto',
          'top',
          'top-start',
          'top-end',
          'right',
          'right-start',
          'right-end',
          'bottom',
          'bottom-start',
          'bottom-end',
          'left',
          'left-start',
          'left-end',
        ]),
        /**
         * Boundary for the callout; either a selector or a DOM element
         */
        boundary: PropTypes.oneOfType([PropTypes.string, PropTypes.object]),
        /**
         * Maximum width of the callout
         */
        maxWidth: PropTypes.number,
      };

      static defaultProps = {
        delay: 100,
        placement: 'top',
        content: '',
        boundary: null,
        maxWidth: 300,
      };

      state = { show: false };

      trigger = () => {
        this._timer = setTimeout(this.show, this.props.delay);
      };

      show = () => {
        this.setState({ show: true });
      };

      cancel = () => {
        this.setState({ show: false });
        clearTimeout(this._timer);
      };

      renderReferenceContent = ({ ref }) => {
        /* skip all props used by component and let outermost component to take an extra props */
        const { delay, children, content, boundary, maxWidth, placement, ...extra } = this.props;
        return (
          <div
            style={{ display: 'inline-block' }}
            ref={ref}
            onMouseOver={this.trigger}
            onMouseLeave={this.cancel}
            {...extra}
          >
            { this.props.children }
          </div>
        )
      };

      renderPopperContent = ({ ref, style, placement }) => (
        <Container
          innerRef={ref}
          style={style}
          data-placement={placement}
          maxWidth={this.props.maxWidth}
        >
          {this.props.content}
        </Container>
      );

      getBoundariesElement = () =>
        typeof this.props.boundary === 'string'
          ? document.querySelector(this.props.boundary)
          : this.props.boundary;

      render() {
        const { placement } = this.props;
        const { show } = this.state;

        return (
          <Manager>
            <Reference>{this.renderReferenceContent}</Reference>
            {show && (
              <Popper
                placement={placement}
                positionFixed
                modifiers={{
                  preventOverflow: {
                    boundariesElement:
                      this.getBoundariesElement() || window.document,
                  },
                }}
              >
                {this.renderPopperContent}
              </Popper>
            )}
          </Manager>
        );
      }
    }

    export default Callout;